Oblique collisions of three wet spheres
Oblique collisions of three wet spheres
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DOI：
10.1063/5.0171810
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发表时间：
2023-10
影响因子：
4.6
通讯作者：
Robert H. Davis
中科院分区：
文献类型：
--
作者：
Robert H. Davis
斜碰撞的三个固体球涂有薄粘性层进行了模拟，既阐明有趣的物理碰撞的结果，并奠定了基础的一种新的方法来模拟流动的许多湿颗粒。分析中包括流体粘性力和毛细力，以及固体接触力和摩擦力。一种新的方法是基于一个旋转的极坐标系的每个粒子对近接触，包括一个给定的粒子是同时与其他两个粒子接触的可能性。随着斯托克斯数（颗粒惯性和粘性力的无量纲比率）增加，碰撞结果从完全附聚（所有三个颗粒由于粘性力和毛细力粘在一起）发展到部分附聚（两个颗粒粘在一起，而第三个颗粒分离）再到完全分离（所有三个颗粒在碰撞后分离）。计算结果还对各种物理和几何性质敏感，如流体膜厚度与颗粒直径之比、摩擦系数和碰撞角。
Oblique collisions of three solid spheres coated with thin viscous layers are simulated, both to elucidate the interesting physics of the collision outcomes and to lay the groundwork for a new approach to modeling flows of many wet particles. Included in the analysis are fluid viscous and capillary forces, as well as solid contact and friction forces. A novel approach is developed based on a rotating polar coordinate system for each particle pair in near contact, including the possibility that a given particle is in simultaneous contact with both other particles. As the Stokes number (a dimensionless ratio of particle inertia and viscous forces) is increased, the collision outcome progresses from full agglomeration (all three particles sticking together due to viscous and capillary forces) to partial agglomeration (two particles sticking together while the third one separates) to full separation (all three particles separating post-collision). The results are also sensitive to various physical and geometrical properties, such as the ratio of fluid film thickness to particle diameter, the coefficient of friction, and the collision angles.